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A. T. CROSS.

v'ISZIETHOD 0F ENAMELING 0R JAPANNING HOLLUW ARTGLES. No. 803,817. Patented Aug.- 19, 1884.

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ALONZO T. CROSS, OF PROVIDENCE, RHODEISLAND.

METHOD OF ENAMELING OR JAPANNING HOLLOW ARTICLES.

SPECIFICATION forming part of Letters Patent No. 303,817, dated August 19, 1884.

Application tiled July 17, 1884. (No model.)

To @ZZ whom t may concern,.-

llc it known that l, ALONZO T. Guess, of,

Providence, in the State of Rhode Island, have invent-ed an' Improvement in the Method of Enameling or Japanning Hollow Articles, of which the following is a specification.

My invention relates to an improved meth od for coating hollow articles having an open aperture, so that the coating of enamel or japan may have a sharp terminal line at the boundary edge of the hollow aperture, thus adapting the same to form a clean-cut joint with other parts or materials adapted to enter the said aperture; and my invention consists in applying a temporary removable plug to the aperture prior to the process of coating and baking, with 'the subsequent forcible re nioval of the plug.

Figure l represents an elevation and partial section of a tube having a rounded end, and adapted, when finished, to form the outer case of a lead or crayon holder. Fig. 2 represents al longitudinal section of the same, showing an inserted plug by means ot' which the aperture at the rounded end is closed preparatory to cnameling or japanning. Fig. 3 represents a longitudinal section of the same, when pro-- vided with a coating of enamel or japan. Fig. lreprcsents a longitudinal section of the enameled or japanned tube with the plug removed, thus leaving a sharplyiinished edge adapted to form a close j oint with the adjoining parts ot' a lead or crayon holder. Fig. 5 is a plan view, and Fig. 6 an edge view, ofa pasteboard plug adapted for closing the aperture ofthe tube and for subsequent ready removal to form the properly-finished edge.

In the accompanying drawings, A represents a tube one end of which is rounded from the outer side, b, to a sharp edge at the aperture a ofthe central bore; and heretofore in the process of enameling or japanning such tubes it has not been found practicable ,to secure the desired regularityin the nish at the rounded end of the tube, especially at the junction of the outer surface with the bore a; and in order to successfully accomplish the desired result, I have adopted the improved method of placing a narrow removable plug,

I3, within the aperture a, and I preferably make the plug B of pastcboard, on account of the economy of manufacture and the adaptability of the material for the purpose required; but other suitable materials may be used. The plug B is inserted into the orifice a of the tube A so that the outer side of the pl ug will come flush with the end of the same. I then apply a continuous enamel or `japan coating, c, to the tube A and plug B, as shown in Fig. 3, after which I drive out the plug B, as shown in Fig. 4; and practice has shown that the result of this method is the production of a desirably-true edge, which is adapted. to form a practically-perfect joint with the pro- `iecting parts of a lead or crayon holder.

Although I have shown my inventiomas applied to the manufacture of the case-tubes of lead or crayon holders only, it will be un derstood, of course, that I do not limit my invention to such tubes, but include the employment of a temporary removable plug in serted flush with the outer surface, for produc ing a iinished edge at the open aperture of any hollow, enameled, or japanned article.

I am aware that removable plugs extending beyond the continuation of the exterior surface of the hollow article have been heretofore employed to prevent the flow of enamel or japan into the cavity of the same; but the removal of a plug so arranged will not produce the effect desired.

I claim as my invention- The improved method of forming a sharply-delined boundary-line at the enameled or japanned surface of a hollow article, which consists in applying a temporary removable plug ilush with the outer surface otl the cxternal aperture of thehollow article, and after coating the exterior of the article and removable plug with enamel or japan and baking the same, forcibly removing the plug, whereby a sharply-defined edge will be produced, substantially as described.

ALONZO T. CROSS.

lVitnesses:

SOCRATES, Sorromumin, JOHN S. LYNCH. 

